If your Chevy Cavalier's fuel gauge is not working, it could be due to a faulty fuel level sensor, a broken wiring connection, or a malfunctioning gauge itself. Start by checking the fuse related to the fuel system, as a blown fuse could cause the gauge to stop functioning. If the fuse is intact, inspect the wiring and connections at the fuel tank and gauge. If these components appear to be in good condition, the gauge or the fuel level sender may need replacement.
A blown fuse can cause your fuel gauge and speedometer to stop working. Replace the fuse. The fuse can be found in the fuse box. The location of the fuse will be listed on the inside cover of the fuse box.
First check the fuse for the 2003 Cavalier gauge. Next check the fuel sending unit in the fuel tank to insure that its working properly. Check the gauge next, then the wiring for the system. One of these units is causing your gauge to not work.
check ground first
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It's not fused separately. If your fuel gauge isn't working, you either have faulty wiring to the gauge, or a faulty fuel sending unit.
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Chevy's are known for this problem, i just recently had the same problem and what you need to do is replace the fuel sending unit. My original problem had to do with my fuel pump not working and i wasn't really worried about the gauge but we figured since we had the tank down we might as well swap the sending unit and my gauge starting working. Good luck